Elizabeth Margolis
Email: lizzie@lizzie136.com
LinkedIn: https://www.linkedin.com/in/eportillaf
GitHub: https://github.com/lizzie136

Summary
Full-stack engineer with 5+ years building internal tools, ingestion engines, rendering systems, and operational platforms for SaaS products. Experienced in AI-assisted engineering using Cursor, Claude Code, Copilot, and Aider. Available for contract roles ($125–$150/hr) or FTE, with availability to start on Monday 24th.

Skills
- Languages: JavaScript, TypeScript, Go, Python
- Frontend: React, Next.js, Zustand, Redux, Storybook
- Backend: Node.js, Express, GraphQL, REST, AWS Lambda
- Systems: ETL pipelines, ingestion engines, Amazon S3, CloudFront, GitHub Actions
- AI / LLM: Copilot, Cursor, Claude Code, Aider, LLM prompt evaluation

Experience
Software Engineer — Kiddom (Nov 2022 — Nov 2025)
- Redesigned the curriculum ingestion workflow with a front-end ETL tool that transforms thousands of lesson files into structured JSON inside the Kiddom platform.
- Built and maintained internal React + TypeScript tooling and web applications, improving accessibility compliance and classroom usability.
- Resolved ingestion failures across S3, caching, and metadata syncing layers, boosting platform reliability.
- Explored AI-assisted workflows including prompt evaluation/scoring, model comparison, and debugging LLM behaviors for internal tools.

Software Engineer Contractor — Pinterest (via BairesDev) (Sep 2020 — Nov 2022)
- Developed React/TypeScript interfaces powering internal dashboards across operational teams.
- Improved reliability of API-driven flows by refactoring data-fetching patterns and reducing regressions.
- Shipped full-stack features that integrated Node/GraphQL backend services.

Head Coach & Experimentation Engineer — Laboratoria (2018 — 2020)
- Designed a zero-to-one experimentation framework that taught agile and hypothesis-driven iteration.
- Led technical programs in Mexico, managing curriculum delivery and instructor performance.

Earlier Roles — Able Co., Avantica, Telefónica Perú (2013 — 2020)
- Built React frontends, native iOS applications, and early ETL workflows supporting multiple business lines.

Ongoing Training
- Python & SQL sharpening
- AI-assisted workflows with Cursor, Claude Code, Copilot, and Aider
- LLM prompt evaluation, scoring, and model comparison

Education
Bachelor in Computer Science (Software Engineering), UPC (Peru) — Top 10th Percentile (Feb 2011)